/* * Copyright (c) 2018 Google Inc. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @test * @run junit DelegatingIteratorForEachRemaining */ import org.junit.Assert; import org.junit.Test; import java.util.Collection; import java.util.Collections; import java.util.HashMap; import java.util.Iterator; import java.util.Map; import java.util.Objects; import java.util.Set; import java.util.Spliterator; import java.util.function.BiConsumer; import java.util.function.BiFunction; import java.util.function.Consumer; import java.util.function.Function; import java.util.function.Predicate; import java.util.stream.Stream; public class DelegatingIteratorForEachRemaining { static abstract class ForwardingIterator<E> implements Iterator<E> { private final Iterator<E> delegate; protected ForwardingIterator(Iterator<E> delegate) { this.delegate = Objects.requireNonNull(delegate); } @Override public boolean hasNext() { return delegate.hasNext(); } @Override public E next() { return delegate.next(); } @Override public void remove() { delegate.remove(); } @Override public void forEachRemaining(Consumer<? super E> action) { delegate.forEachRemaining(action); } } static final class ThrowingIterator<E> extends ForwardingIterator<E> { public ThrowingIterator(Iterator<E> delegate) { super(delegate); } @Override public void forEachRemaining(Consumer<? super E> action) { throw new UnsupportedOperationException(); } } static abstract class ForwardingSet<E> implements Set<E> { private final Set<E> delegate; protected ForwardingSet(Set<E> delegate) { this.delegate = Objects.requireNonNull(delegate); } @Override public int size() { return delegate.size(); } @Override public boolean isEmpty() { return delegate.isEmpty(); } @Override public boolean contains(Object o) { return delegate.contains(o); } @Override public Iterator<E> iterator() { return delegate.iterator(); } @Override public Object[] toArray() { return delegate.toArray(); } @Override public <T> T[] toArray( T[] ts) { return delegate.toArray(ts); } @Override public boolean add(E e) { return delegate.add(e); } @Override public boolean remove(Object o) { return delegate.remove(o); } @Override public boolean containsAll( Collection<?> c) { return delegate.containsAll(c); } @Override public boolean addAll( Collection<? extends E> c) { return delegate.addAll(c); } @Override public boolean retainAll( Collection<?> c) { return delegate.retainAll(c); } @Override public boolean removeAll( Collection<?> c) { return delegate.removeAll(c); } @Override public void clear() { delegate.clear(); } @Override public boolean equals(Object o) { return delegate.equals(o); } @Override public int hashCode() { return delegate.hashCode(); } @Override public Spliterator<E> spliterator() { return delegate.spliterator(); } @Override public boolean removeIf(Predicate<? super E> filter) { return delegate.removeIf(filter); } @Override public Stream<E> stream() { return delegate.stream(); } @Override public Stream<E> parallelStream() { return delegate.parallelStream(); } @Override public void forEach(Consumer<? super E> action) { delegate.forEach(action); } } static class ThrowingSet<E> extends ForwardingSet<E> { public ThrowingSet(Set<E> delegate) { super(delegate); } @Override public ThrowingIterator<E> iterator() { return new ThrowingIterator<>(super.iterator()); } } static abstract class ForwardingMap<K, V> implements Map<K, V> { private final Map<K, V> delegate; public ForwardingMap(Map<K, V> delegate) { this.delegate = delegate; } @Override public int size() { return delegate.size(); } @Override public boolean isEmpty() { return delegate.isEmpty(); } @Override public boolean containsKey(Object o) { return delegate.containsKey(o); } @Override public boolean containsValue(Object o) { return delegate.containsValue(o); } @Override public V get(Object o) { return delegate.get(o); } @Override public V put(K k, V v) { return delegate.put(k, v); } @Override public V remove(Object o) { return delegate.remove(o); } @Override public void putAll(Map<? extends K, ? extends V> map) { delegate.putAll(map); } @Override public void clear() { delegate.clear(); } @Override public Set<K> keySet() { return delegate.keySet(); } @Override public Collection<V> values() { return delegate.values(); } @Override public Set<Entry<K, V>> entrySet() { return delegate.entrySet(); } @Override public boolean equals(Object o) { return delegate.equals(o); } @Override public int hashCode() { return delegate.hashCode(); } @Override public V getOrDefault(Object key, V defaultValue) { return delegate.getOrDefault(key, defaultValue); } @Override public void forEach(BiConsumer<? super K, ? super V> action) { delegate.forEach(action); } @Override public void replaceAll(BiFunction<? super K, ? super V, ? extends V> function) { delegate.replaceAll(function); } @Override public V putIfAbsent(K key, V value) { return delegate.putIfAbsent(key, value); } @Override public boolean remove(Object key, Object value) { return delegate.remove(key, value); } @Override public boolean replace(K key, V oldValue, V newValue) { return delegate.replace(key, oldValue, newValue); } @Override public V replace(K key, V value) { return delegate.replace(key, value); } @Override public V computeIfAbsent(K key, Function<? super K, ? extends V> mappingFunction) { return delegate.computeIfAbsent(key, mappingFunction); } @Override public V computeIfPresent(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) { return delegate.computeIfPresent(key, remappingFunction); } @Override public V compute(K key, BiFunction<? super K, ? super V, ? extends V> remappingFunction) { return delegate.compute(key, remappingFunction); } @Override public V merge(K key, V value, BiFunction<? super V, ? super V, ? extends V> remappingFunction) { return delegate.merge(key, value, remappingFunction); } } static class ThrowingMap<K, V> extends ForwardingMap<K, V> { public ThrowingMap(Map<K, V> delegate) { super(delegate); } @Override public ThrowingSet<Entry<K, V>> entrySet() { return new ThrowingSet<>(super.entrySet()); } @Override public Set<K> keySet() { return new ThrowingSet(super.keySet()); } } static<E> void assertThrowingIterator(Iterator<E> iterator) { try { iterator.forEachRemaining((entry) -> {}); Assert.fail(); } catch (UnsupportedOperationException expected) { } } private static Map<String, Object> map() { Map<String, Object> map = new HashMap<>(); map.put("name", "Bill"); map.put("age", 23); return new ThrowingMap<>(map); } @Test public void testUnwrapped() { assertThrowingIterator(map().entrySet().iterator()); assertThrowingIterator(map().keySet().iterator()); } @Test public void test_unmodifiableMap_entrySet() { assertThrowingIterator(Collections.unmodifiableMap(map()).entrySet().iterator()); } @Test public void test_checkedMap_entrySet() { assertThrowingIterator(Collections.checkedMap(map(), String.class, Object.class).entrySet().iterator()); } @Test public void test_entrySet_checkedSet() { Set<Map.Entry<String, Object>> entrySet = map().entrySet(); Class clazz = entrySet.iterator().next().getClass(); assertThrowingIterator(Collections.checkedSet(entrySet, clazz).iterator()); } }